add warning if total parametric volume is less then 1

6 jobs for master in 8 minutes and 4 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
passed #129303
Linux
clang-c++11

00:08:04

passed #129307
Linux
clang-c++14

00:08:02

passed #129301
Linux
gcc-c++11

00:03:29

passed #129305
Linux
gcc-c++14

00:03:28

passed #129308
Apple
macos-c++11

00:05:10

passed #129309
Apple
macos-c++14

00:03:00